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9p: Add splice_read wrapper 

Add a splice_read wrapper for 9p.  We should use copy_splice_read() if
9PL_DIRECT is set and filemap_splice_read() otherwise.  Note that this
doesn't seem to be particularly related to O_DIRECT.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Christoph Hellwig <hch@lst.de>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: Eric Van Hensbergen <ericvh@kernel.org>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Christian Schoenebeck <linux_oss@crudebyte.com>
cc: v9fs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
cc: linux-block@vger.kernel.org
cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20230522135018.2742245-15-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells 2023-05-22 14:50:01 +01:00 committed by Jens Axboe
parent 67178fd066
commit c829d0bd33
1 changed files with 24 additions and 2 deletions
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26
fs/9p/vfs_file.c
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@ -374,6 +374,28 @@ v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
return ret;
}
/*
* v9fs_file_splice_read - splice-read from a file
* @in: The 9p file to read from
* @ppos: Where to find/update the file position
* @pipe: The pipe to splice into
* @len: The maximum amount of data to splice
* @flags: SPLICE_F_* flags
*/
static ssize_t v9fs_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags)
{
struct p9_fid *fid = in->private_data;
p9_debug(P9_DEBUG_VFS, "fid %d count %zu offset %lld\n",
fid->fid, len, *ppos);
if (fid->mode & P9L_DIRECT)
return copy_splice_read(in, ppos, pipe, len, flags);
return filemap_splice_read(in, ppos, pipe, len, flags);
}
/**
* v9fs_file_write_iter - write to a file
* @iocb: The operation parameters
@ -569,7 +591,7 @@ const struct file_operations v9fs_file_operations = {
.release = v9fs_dir_release,
.lock = v9fs_file_lock,
.mmap = generic_file_readonly_mmap,
.splice_read = generic_file_splice_read,
.splice_read = v9fs_file_splice_read,
.splice_write = iter_file_splice_write,
.fsync = v9fs_file_fsync,
};
@ -583,7 +605,7 @@ const struct file_operations v9fs_file_operations_dotl = {
.lock = v9fs_file_lock_dotl,
.flock = v9fs_file_flock_dotl,
.mmap = v9fs_file_mmap,
.splice_read = generic_file_splice_read,
.splice_read = v9fs_file_splice_read,
.splice_write = iter_file_splice_write,
.fsync = v9fs_file_fsync_dotl,
};